Add class to manage UI

UI.cs

@@ -0,0 +1,64 @@
+using System;
+
+namespace productlist
+{
+	public static class UI
+	{
+		private enum inputType {
+			create,
+			delete,
+			list,
+			help
+		}
+		private static inputType decodeInputType(string input) {
+			string command = input.Split (null, 1)[0];
+			switch (command.ToLower()) {
+			case "create":
+				return inputType.create;
+			case "delete":
+				return inputType.delete;
+			case "list":
+				return inputType.list;
+			default:
+			case "help":
+				return inputType.help;
+			}
+		}
+
+		public static bool validateInt(string input) {
+			int result;
+			return Int32.TryParse (input, out result);
+		}
+
+		public static bool validateString (object input) {
+			return input is string;
+		}
+
+		public static string getAnswer(string prompt, Func<string, bool> validator) {
+			string input;
+			do {
+				Console.Write(prompt + ": ");
+				input = Console.ReadLine();
+			} while (!validator (input));
+			return input;
+		}
+
+		public static void promptForCommand() {
+			while (true) {
+				Console.Write ("Enter command: ");
+				string command = Console.ReadLine ();
+				inputType type = decodeInputType (command);
+				switch (type) {
+				case inputType.create:
+					Product p = Product.fromPrompt ();
+					Storage.Add (p);
+					break;
+				case inputType.list:
+					Storage.List ();
+					break;
+				}
+			}
+		}
+	}
+}
+

product-list.csproj

@@ -38,6 +38,7 @@
   <ItemGroup>
     <Compile Include="Program.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="UI.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <ItemGroup>